Moisturepboof package



April 5, 1949. c. D. MULLINIX MOISTUREPROOF PACKAGE I 4 Sheets-Sheet 2Original Filed July 19, 1943 C 604 R255 D MULL lN/x,

INVENTOR April 1949. c. D. MULLINIX MOISTUREPROOF PACKAGE 4 Shets-Sheet3 Original Filed July 19, 1945 INVENTOR.

ATTORN EY.

April 1949- c. D. MULLINIX a Re. 23,096

MOISTUREPROOF PACKAGE Original Filed July 19, 1943 4 Sheets-Sheet 4CHAQLEsBMUL /N/X, INVENTOR.

' ATTORNEY.

Reiuued Apr. 5, 1949 MOISTUREPROOF PACKAGE Charles D. Mullinix, LosAngeles, Calif. Original No. 2,335,019, dated November 23, 1943,

Serial No.

495,270, July 19, 1943.

Application for reissue November 22, 1944, Serial No. 566,330

12 Claims.

This invention in its broad aspects relates to improvements in means forpackaging articles especially food products such as butter,oleomargarine, cereal food products, bacon, and the like, and the methodof making up the package and applying it to the food product or otherarticle packaged therein.

While my invention is applicable to the packaging of all kinds ofarticles, as indicated, its advantages are so fully realized in thepackagin of butter, oleomargarine, bacon and the like that for purposeof illustration I shall refer primarily to the packaging of such foods.

Dealing first with butter, moisture evaporation is a serious factor inthe storage and shipping of butter. Evaporation results not only in lossofweight, but and undesirable salt crystals on the surface of thebutter, and a disturbance of the natural butter constituents andconsequent impairment of flavor and quality.

It has been customary to store butter in tubs until ready for shipmentand sale, because the moisture evaporation is less when the butter isretained in large bulk. For shipping and marketing the butter is cutinto prints usually quarter pounds or one pound, and in the case ofquarter pound prints four prints are usually assembled to make up apackage. There is an Elgin style (square cross section) packagegenerally used in the midwest, and in the east, and what is known as theWestern flat style is generally used in the west. My drawings (Figures 1to 6) illustrate a Western fiat package. These designations are by wayof example only for purposes of reference.

In each case the print is wrapped usually in vegetable parchment paper,prints so wrapped are packaged in a waxed carton, or in case a doublewrapped package is desired, a dry waxed sulphite sheet is wrapped aboutthe print or prints previously wrapped in parchment paper and the wholethen packaged in the carton. The cartons are usually of board stockproduced on what is known as a cylinder machine, and in producing suchboard stock fillers are used which sometimes contain contaminatingsubstances. Such cartons are not sealed against escape of moisture, norintrusion of air, dirt and other foreign substances, including odors, I

and in fact have a tendency to gap open at the flaps.

Vegetable parchment paper is permeable by moisture although it has highwet strength. Dry waxed sulphite double wrap is insufficient to preventevaporation of moisture and the like from the butter prints even whenused with the vegetable parchment initial wrap and inside of the waxedboard carton.

It has been found that the means and method in the formation ofunsightly and the print .or-

2 of packaging as described above is relatively expensive and at thesame time unsatisfactory in many important respects. Furthermore,printing on board is ordinarily dull when compared with printing onother types of stock, as for example sulphite, and the cost ofmanufacturing board cartons is considerably more than packages madeaccording to my invention to be described.

The moisture content of butter is estimated to be about twenty per cent.Evaporation losses in weight of butter newly churned are most excessiveduring the first five or ten days. Consequently newly churned butterheretofore must be either immediately packaged and sold or tubbed forstorage, if it is to be marketed with approximately its originalmoisture content. The economic difficulties of immediate sale, and thedouble handling when the butter is tubbed and subsequently packaged areproblems to be overcome by my invention. Moreover the double handlingincreases possibilities of contamination and possible deleterious effecton flavor and quality.

Since butter is greasy, is easily contaminated by dirt, dust and thelike, is influenced by heat and cold, a proper solution of the packagproblem is the primary object of my invention.

In regard to butter substitutes, such as oleomargarine and the like, notonly is the product per se cheaper and less able to sustain the addedload of expensive packa ing, but the product itself and the packagingand dispensing of it is generally subject to many legal restrictions andregulations.

Both butter and oleomargarine are usually overweighed when packed toallow for shrinkage losses when packaged in accordance with the priorart method and means, and there is thus a substantial item ofmoney lossto the producer.

More detailed objects of my invention are to provide a package andmethod of making it which will:

1. Prevent evaporation and moisture losses;

2. Prevent contamination by dust, dirt and foreign substances, such asforeign odors;

3. Reduce packaging costs;

4. Provide a more attractive, more practical and more useful package;

5. Simplify methods of producing the package and introducing thearticles to be packaged therein;

6. Reduce the weight of the package and generally simplify the samewithout loss of utility; and

7. Adapt the package to production on machines now existing with butminor modification. 1

Many of the foregoin subjects are applicable to the modified form ofpackage (Figures 7 to '11) sauce intended primarily for bacon or othermeats. Bacon is presently wrapped eitherin cellophane sheets, or in softgrease-proof paper sometimes enclosed in board cartons. The cellophaneor waxed paper gives no support as a package, and the board cartons aresubject to the same deiiciencies as in the case of packaging butter.

' The essence of my invention. as brought out in this specification, isparticularly useful in packaging bacon. The same type of laminated blankis employed, and the completed package has the same generalcharacteristics, but because of the nature of bacon (it has a solventeffect on the parafllne and renders my package substantially selfsealing), I find that a modified form of folding is advantageouslyemployed.

Other objects and advantages of my invention will become apparent from afurther consideration of the description and claims which follow.

In the drawings:

Figure 1 is a top plan view of a package blank embodying the features ofmy invention.

Figure 2 is a cross-section taken on the line 2-2 of Figure 1.

Figure 3 is a perspective view illustrating my package as partly formed.

Figure 4 is an end view of the package shown in Figure 3 in a furtherstate of completion.

Figure 5 is an end view similar to Figure 4 illustrating an additionalstep in the fabrication of my package.

Figure 6 is a perspective view showing the package completed.

Figure 7 is a top plan view of a modified form of package blankembodying the features of my invention.

Figure 8 is a cross-section taken on the line 8-8 of Figure 7.

Figure 9 is a perspective view illustrating my modified package aspartly formed.

Figure 10 is a perspective view of the package shown in Figure 9 in afurther state of completion.

Figure 11 is aperspective view showing the modified package completed.

Referring to the form of the invention shown in Figures 1 to 6:

In the drawings I have omitted illustration of the contents of thepackage in order to clarify the illustration of the package itself. Itis to be understood that in the-packaging of butter, oleomargarine andother articles or products having the approximate form of the finishedpackage, the article will be inserted therein as the package is in theprocess of formation prior to the condition shown in Figure 3, accordingto the preferred method of forming and utilizing the package, althoughit may be prepared on an aluminum or other type of form leaving one endonly open for filling as for example in the case of cereals, and suchopen ends may be subsequently closed by a vacuum method of a charactergenerally understood in the art.

The package is made of laminated paper blanks having at least twolayers, bonded by parafllne and latex or other moisture-proofingsubstance. The blanks are most efficiently manufactured from previouslyprepared rolls of the required finished width, simultaneously fed fromthe rolls in continuous webs or strips. While more than two layers maybe employed, I find the use of two adequate, and will refer to only twoin outlining the steps of the process.

The blank Ill illustrated in Figure 1 is made in the following manner:paper, preferably sulphite stock of diiferent thicknesses and widths,undergoes a continuous process involving the following steps:

1. Labels or other indlcia are printed in the areas designated by therectangles ll, l2, l3 and ii, on the paper which is to comprise theouter layer of the lamination. This printing is preferably done withaniline or any quick drying ink of a character to be set by wax. In theform chosen for illustration the outer layer I5 is relatively heavy andthe inner layer It is relative light stock.

2. The two sheets of paper are immersed in a heated mixture of paraflineand latex or other moisture proofing bonding substance.

3. The wax paper in correct lateral registration is passed between rollswhich compress the two sheets together.

4. Upon leaving the pressure rolls the laminated material is immersed inan icewater bath to set the wax and latex.

5. The laminated web is vacuum dried.

6. Transverse lines I! which define the top and bottom corners i8 of thecompleted package are scored.

'7. The web is cut in lengths to form the blank.

Each blank thus comprises a rectangular laminated sheet of relativelythick heavy paper of lesser width and relatively thin light paper ofgreater width as illustrated, the laminations being bonded by a moistureproof material which impregnates the paper at the same time that itfurnishes a. bond between the laminations. This treatment also impartsbody and stiflness to the blank, enabling the use of lighter paper forthe heavy layer l5 than can be used satisfactorily for board cartons.

The margin of the heavy paper I! is indicated at l8, and the margin ofthe light paper It is indicated at Ill. Certain fold lines are shown inFigure l by reference numeral II, but these are for illustrativepurposes only and according to my preferred method of producing theblank are not scored thereon.

I may produce the blanks in a manner to utilize the heavier layer on theoutside, as illustrated; but for packaging some products the position ofthe heavier and lighter layers may be reversed. In packaging butter theillustrated form is ordinarily used. Assuming these blanks are to beused for packaging butter or any other product preformed into a singleprint the full size of the package or into a plurality of printsassembled into the same total size, the packaging is performed insubstantially the following manner:

(1) The blanks being contained in any suitable magazine, butter isintroduced against the center panel In, and panels lid and Horepresenting the top and bottom of the finished package are folded over,machines for this purpose being known to the art. Of course the sameoperation may be performed by hand. It is to be understood that Iutilize a true method in the sense that the various steps now beingdescribed may be done manually, but that in practice it is preferable toutilize machines for the purpose.

(2) Side edge 22 is folded along the scored line and sufficient heat isapplied to soften the parafllne and latex on the outer surface thereof.

(3) Overlapping edge I la is then folded up and pressed into contactwith edge 22, cold being applied to set the bond of parafllne and latexbetween the contacting surfaces of the two edges.

The package at this stage has the appearance illustrated in Figure 3.

(4) The side portions 23 and 24 of the ends are folded in preferably byuse of a hot fin er which softens the e and latex on the outer surface.

(5) The top end fiaps 25 are folded down and heat is simultaneouslyapplied to soften the parafllne and latex on the outer surface.

. (6) The bottom end fiaps 26 are folded up and brought into contactwith the fiaps 25. A cold plate may be used for this purpose.

In heating the parafline and latex where the various folding isperformed, it is preferable to utilize hot fingers or plungers whichsoften the parafline and latex as the folding is taking place, so thatno prolonged heat is introduced to the butter or other contents of thepackage.

This is important, because heat applied to butter will discolor andotherwise injure it.

The edges is of the heavy layer l5 represent the end margins of thepackage, the end folding of the lighter layer ii taking place along suchmargins. The fold lines 2| indicated in Figure 1 may of course be scoredon the blanks, but this is not necessary, and the folding of the ends isreadily accomplished in the manner described.

If the package is to contain cereal or other material or articles notpreformed into prints naturally filling the package, it may be formed inthe manner described to the extent applicable on an aluminum block orother type of form, leaving one end open, and after filling, the openend may be folded and sealed by the application of heat and preferably-avacuum plate of a type known to the art whereby a flap end closure isaccomplished.

- Packages of this general character are ordinarily stacked bottom upontop or on their side edges, not upon their ends. Therefore it isimportant that the top, bottom and sides of the package embody afirmness and protective rigidity which is not necessary at the end. Ihave thus used this fact to achieve a package which offers adequatefirmness and protective rigidity over all surfaces where that quality isnecessary,

and by eliminating heavier layers at the end,

where it is not needed, I am enabled to perform compound folding andsealing operations described which would be quite diificult andunsatisfactory if the heavy layer of the laminated blank extended thefull width thereof.

My package is completely sealed against dirt and other foreignsubstances, is grease resistant, and is moisture proof to the extentnecessary to retain butter, oleomargarine, or other food products withsubstantially their original moisture content and in a conditiongenerally realized in canning processes. While in the preferred exampleof my invention I use a mixture of paraiilne and latex to impregnate thepaper and form the bond between the laminations as well as the finalsealing of the package, the latex may be eliminated, and the paramnealone used, or I may substitute some other form of moisture proofsealing bond. It should have adhesive qualities, and preferably coat thesurface of the sheet material as well as impregnate the same. It shouldrender the blank substantially impervious to air and moisture andresistant to grease. In any event I am enabled to produce in a singlepackaging operation, a completely sealed package having the necessaryprotective qualities, of improved appearance, and the ability to retainits shape and original sealing qualities indefinitely.

lil

I do not limit myself to the use of sulphite stock, as my method may beemployed with other types of stock, but as sulphite stock may bemanufactured cheaper than board and is adequate for ordinary purposes,my invention is responsible for the attendant saving. The nearestapproach to a sealed carton or package of this general character, withinmy knowledge, is the combinattion of a board carton made in theconventional manner, and as a second operation enclosed with waxedpaper. This involves a considerablenu-m ber of manufacturing operationsnot required in my invention, and is unsatisfactory in various otherrespects. As before stated, packaging ac-- cording to my invention maybe accomplished manually, but is preferably done by machine. only slightmodifications of available machinery being necessary to perform theseveral steps described.

My package is impervious to air in the general-y ly accepted meaningwith reference to treated paper containers. It is not absolutelyairtight; but is substantially so, and the term is to be so construedwhen used in the claims.

Carton board is made on cylinder machines of which there are but arelatively small number in' existence, and these are in tremendousdemand at the present time due to the need for carton board inconnection with national defense industries. There is no presentshortage, however, in Fourdrlnier machines, which are capable of making.009 solid stock. This weight is too light to use alone for foodcartons, but is adequate as the heavy lamination in my improved package.

The usual minimum weight of carton board used in food packages is .016,and my laminated blank in a combined weight not over .012 has firmnessand rigidity equal to that of the .016 carton board.

Although I have herein shown and described my invention in what I haveconceived to be the most practical and preferred embodiment, it isrecognized that departures may be made there from within the scope of myinvention, which is not to be limited to the details disclosed hereinbut is to be accorded the full scope of the claims so as to embrace anyand all equivalent structures and methods.

For instance the inner layer may be made of greaseproof or vegetableparchment paper applicable especially to the packaging of oleomar garineand eliminating the conventional parch ment inner wrap such as is usedwith the old style carton containing oleomargine.

While, for convenience in description, I have specifically mentionedpaper stocks as comprising th laminations of my blank, it is within thescope of my invention to utilize other sheet material having the generalprotective and manipulative characteristics ascribed to paper stocks.Such materials are known which are inherently heat sealing, and may bebonded to a second lamination without the preliminary bonding bathdescribed for paper, by pressing under heated rolls. Other cellulosematerials, such, for example, as cellophane, can be subjected to thesame treatment as described for paper.

If desired, a window package may be made in using a transparent lightlamination, and cutting out an area in a panel or panels of the heavylamination.

In the modified form of package shown in Figures 7 to 11, I may employ alaminated blank "comprising at least one light sheet ii and at cause 7least one heavy sheet 52, using materials and a laminating method asalready described.

F or bacon, and other meat products, the light sheet is preferably onthe inside of the completed package, butthis is optional.

Scoring 53, 54, 55 and 56 through the multiple thickness sectionprovides rectangular areas 51, 58 and 58 defined by the scoring and theedges II and ii of the heavy sheet, upon which labeling and advertisingindlcia may be printed on the surface which is to be the outside of thepackage. It is immaterial whether the score lines extend into themarginal portions of the light sheet.

The score lines in pairs 53 and 54, and 55 and 55, are individuallyspaced leaving rectangular areas 62 and 53 which will form the sidewalls of the package.

In handling the blank to form the package, the product (for example,bacon '54) is laid on the open blank within the boundaries of the area58. The marginal extensions 55 and E of the light sheet only are foldedin as shown in Figure I to close the ends of the package. While thesheet material employed should be grease reslstant, the grease in thebacon has some solvent effect on the parafline in the blank and tends tosoften the surface enough to cause the material to cling to the bacon;moreover, as bacon is sticky, it tends to cling to the surface of anypaper or cellulose material, especially if the suriace is smooth, andthus effect an adhesion between the bacon and the material of thepackage.

The next step is to fold over the area 59, along the scoring 55 and 56,as shown in Figure 10.

The final step is to fold the partly completed package over so that thearea 58 is uppermost and the area 51 is lowermost, as shown in Figure11. This particular manner of completing the package is not essential,as the flap which includes the area 51 may be used as the top of thepackage, but in doing it as first described the weight of the bacon isutilized in closing the package. The package in conjunction with thebacon is self-sealing, in any event. Heat may be applied to seal, ifdesired, but with a product such as bacon which imparts the solventaction or has the adhesive qualities referred to, the heat sealing isnot necessary. The solvent action is mild, and afiects only the innersurface region of the package. Such packages having flat tops, bottomsand sides, will stack conveniently, and even after being opened can bereclosed and will maintain their shape.

Paper and other cellulosic sheet material, such as cellophane,contemplated as suitable for practising my invention, are alwaysmanufactured with a grain and always formed into rolls with the grainrunning lengthwise of the web as delivered from the roll. This isstandard and universal in the art, and is well known. Such material willbend, curl or crease more readily with the grain than across it. This isalso well known. I take advantage of this phenomena by laminating thesheets with the grain running in the same direction in both sheets andwith such grain running lengthwise of the cut blanks, that is to sayfrom one cut end to the other. The scoring, on the plural layer sectionat least, is parallel to the ends of the blank and therefore at rightangles to the grain of the material. Thus, when the score lines are usedas corners when forming the package, the direction of the grain issubstantially parallel to a plane representing the vertical crosssection of the package, thereby attaining the maximum vertical andtransverse rigidity, or in other words resistance against deformationi'rom pressure on the top or sides of the package. The same structuraladvantage is realized in a package which is formed from a blank asillustrated in Figure 1 but with a greater number of score lines ll, asfor example eight score lines by which a package with an octagon crosssection can be formed, or as illustrated in Figure 7 but with only twoscore lines instead of the respective pairs 53-54 and 55-55. Employingtwo wide score lines would result probably in a package of substantiallyrectangular cross section but if the lines were narrow the package mighthave a somewhat elliptical cross section. If a blank is used which hasno scoring at all, to form a package which is oval or circular in crosssection, corresponding in shape to the Country roll of butter, theadvantage of maximum rigidity is realized by the same expedient ofhaving the grain run from end to end of the blank which results in thegrain running circumferentially of the vertical cross section of thepackage. Regardless of the exact shape and character of the finishedpackage, the important thing is the formation of the blank with thegrain running from end to end, and the use of the blank in forming thepackage so that the grain supports the package vertically andtransversely. By the term end is meant the opposite edges where theplural layers lie coincident, regardless of whether the blank is long orshort and regardless of the relative measurement from side to side, theterm side" meaning the opposite edges where the light sheet extendsbeyond the margin of the heavy sheet.

This is an application for reissue of my Patent No. 2,335,019, grantedNovember 23, 1943, upon an application which was a continuation in partof my then copending application Serial No. 403,351, filed July 21,1941.

Having described my invention, what I claim as new and desire to secureby Letters Patent is:

1. Packaging means comprising a. laminated blank formed with at leastone relatively heavy paper sheet and at least one relatively light sheetof cellulose material, such blank being treated with a moisture proofadhesive substance which secures the heavy sheet throughout its area tothe light sheet and renders the blank substantially impervious to airand moisture, spaced parallel fold lines extending transversely of thelaminated central portion of the blank, the heavy sheet being of lesswidth than the light sheet but of the same length, the sheets beingpositioned with their medial longitudinal lines and their endscoinciding, the laminated central portion of the blank being relativelystill, and the blank folded along the fold lines so that the centrallaminated portion constitutes a relatively strong and rigid body parthaving a rectangular cross section about the top, bottom and sides ofthe product packaged, and the marginally extending portions of the lightsheet only folded to close the ends of the package, and the overlappingfolds sealed to make the package substantially impervious to air,moisture, and other deleterious influences which might affect thecontents.

2. Packaging means comprising a laminated blank formed with at least onerelatively heavy paper sheet and at least one relatively light papersheet, such blank being treated with wax which secures the heavy sheetthroughout its area to the light sheet and renders the blanksubstantially impervious to air and moisture, spaced parallel fold linesextending transversely of the laminated central portion of the blank,the heavy sheet being of less width than the light sheet but of the samelength, the sheets being positioned with their medial longitudinal linesand their ends coinciding, the laminated central portion of the blankbeing relatively stiff, and the blank folded along the fold lines sothat the central laminated portion constitutes a relatively strong andrigid body part about the top, bottom and sides of the product packaged,and the marginally extending portions of the light sheet only folded toclose the ends of the package, and the overlapping folds heat sealed tomake the package substantially impervious to air. moisture, and otherdeleterious influences which might affect the contents.

3. Packaging means comprising a laminated blank formed with at least onerelatively heavy paper sheet and at least one relatively light sheet ofcellulose material, such blank being treated with a moisture proofadhesive substance which secures the heavy sheet throughout its area tothe light sheet and renders the blank substantially impervious to airand moisture, spaced parallel fold lines extending transversely of thelaminated central portion of the blank, the heavy sheet being of lesswidth than the light sheet but of the same length, the sheets beingpositioned with their medial longitudinal lines and their endscoinciding, the laminated central portion of the blank being relativelystiff, and the blank being folded along the fold lines so that thecentral laminated portion constitutes a relatively strong and rigid bodypart having a rectangular cross section about the top, bottom and sidesof the product packaged, and the marginally extending portions of thelight sheet only folded to close the ends of the package withsubstantially none of the light sheet extending beyond the ends of theheavy sheet.

4. Packaging means comprising a laminated blank formed with at least onerelatively heavy paper sheet and at least one relatively light sheet ofcellulose material, both sheets of such blank being impregnated with amoisture proof, adhesive substance which secures the heavy sheetthroughout its area to the light sheet, coats the surfaces of the blank,and renders the blank substantially impervious to air and moisture andresistant to grease, spaced parallel fold lines extending transverselyof the laminated central portion of the blank providing rectangularareas defined by the fold lines and the side edges of said heavy sheetfor label printing having a predetermined fixed position on the finishedpackage, the heavy sheet being of less width than the light sheet but ofthe same length, the sheets being positioned with their mediallongitudinal lines and their ends coinciding, the laminated centralportion of the blank being relatively stiff, and the blank being foldedalong the fold lines so that the central laminated portion constitutes arelatively strong and rigid body part having a rectangular cross sectionabout the top, bottom and sides of the product packaged, and themarginally extending portions of the light sheet only folded .to closethe ends of the package.

5. Packaging means comprising a laminated blank formed with at least onerelatively heavy paper sheet and at least one relatively light sheet ofcellulose material, such blank being treated with a moisture proofadhesive substance which secures the heavy sheet throughout its area tothe the blank substantially light sheet and renders impervious to airand moisture, spaced parallel fold lines extending transversely oi. thelaminated central portion of the blank, the heavy sheet being of lesswidth than the light sheet but of the same length, the sheets beingpositioned with their medial longitudinal lines and their endscoinciding, the laminated central portion of the blank being relativelystiff, and the blank being folded along the fold lines so that thecentral laminated portion constitutes a relatively strong and rigid bodypart having a rectangular cross section about the top, bottom and sidesof the product packaged, and the marginally extending portions of thelight sheet only folded inwardly from the side edges of said heavy sheetand covering the end portions of said product to close the ends of thepackage with substantially none of the light sheet extending beyond theends of the heavy sheet.

6. Packaging means comprising a laminated blank formed with at least onerelatively heavy paper sheet and at least one relatively light sheet ofcellulose material, both sheets of such blank being impregnated with amoisture proof adhesive substance which secures the heavy sheetthroughout its area to the light sheet, coats the surfaces of the blank,and renders the blank substantially impervious to air and moisture andresistant to grease, spaced parallel fold lines extending transverselyof the laminated central portion of the blank providing rectangularareas defined by the fold lines and the side edges of said heavy sheetfor label printing having a predetermined fixed position on the finishedpackage, the heavy sheet being of less width than the light sheet but ofthe same length, the sheets being positioned with their mediallongitudinal lines and their ends coinciding, the laminated centralportion of the blank being relatively'stlff, and the blank being foldedalong the fold lines so that the central laminated portion constitutes arelatively strong and rigid body part having a, rectangular crosssection about the top, bottom and sides of the product packaged, and themarginally extending portions of the light sheet only folded inwardlyfrom the side edges of said heavy sheet and covering the end portions ofsaid product to close the ends of the package.

'1. Packaging means comprising a laminated blank formed with at leastone relatively heavy paper sheet and at least one relatively light sheetof cellulose material, such blank being treated with a moisture proofbonding substance which secures the heavy sheet throughout its area tothe light sheet and renders the blank substantially impervious to airand moisture, spaced parallel fold lines extending transversely of the1aminated central portion of the blank, the heavy sheet being of lesswidth than the light sheet but of the same length, the sheets beingpositioned with their medial longitudinal lines substantially coincidingand with their ends coincident, the laminated central portion of theblank being relatively stiff, and the blank being folded along the foldlines so that the central laminated portion defines a relatively strongand rigid body having plane surfaced side panels about the productpackaged, and the marginally extending portions of the light sheet onlyfolded to close the ends of the package with substantially none of thelight sheet extending beyond the ends of the heavy sheet.

8. Packaging means comprising a laminated blank formed with at least onerelatively heavy p per Sheet and at least one relatively light sheet ofcellulose material, such blank being treated with a moisture proofbonding substance which secures the heavy sheet throughout its area tothe light sheet and renders the blank substantially impervious to airand moisture, spaced parallel fold lines extending transversely of thelaminated central portion of the blank, the heavy sheet being of lesswidth than the light sheet but of the same length, the sheets beingpositioned with their medial longitudinal lines substantially coincidingand with their ends coincident, the laminated central portion of theblank being relatively still, and the blank being folded along the foldlines so that the central laminated portion defines a relatively strongand rigid body about the product packaged, andthe marginally extendingportions of the light sheet only folded inwardly from the side edges ofsaid heavy sheet in confronting relation with said heavy sheet forcovering the end portion of said product and to close the ends of thepackage with substantially none of the light sheet extending beyond theends of the heavy sheet.

9. Packaging means comprising a laminated substantially rectangularblank-roll in which each blank when out from the roll is suitable forforming into a container having substantially plane surfaced panels,said blank formed with at least one relatively heavy sheet and at leastone relatively light sheet, such blank possessing a moisture proofingand bonding substance at least on the surfaces thereof which secures theheavy sheet throughout its area to the light sheet and renders the blanksubstantially impervious to air and moisture, spaced parallel scoredfold lines extending transversely of the laminated central portion ofthe blank to predetermine and fix the location of the longitudinal edgefolds of the container, the heavy sheet being of less width than thelight sheet, but of the same length, and the sheets being positionedwith the heavy sheet intermediate the longitudinal sides of the lightsheet so that the heavy sheet is spaced inwardly from the side edges ofthe light sheet and with the ends of the two sheets coinciding, thelaminated central portion of the blank being relatively stiff, and themarginally extending portions of the light sheet being relatively softand pliable and adapted to be folded to form flat endclosures for thecontainer, said bonding substance also being adapted to subsequentlyserve as a seal and to retain the laminated and pliable portions infolded condition.

10. Packaging means comprising a laminated substantially rectangularblank suitable for forming into a container having substantially planesurfaced panels, said blank formed with at least one relatively heavysheet of cellulose material and at least one relatively light sheet ofcellulose material, such blank possessing a moisture proof coat ofbonding substance which secures the heavy sheet throughout its area tothe light sheet and renders the blank substantially impervious to airand moisture, spaced parallel scored fold lines extending transverselyof the laminated central portion of the blank to predetermine and fixthe location of the longitudinal edge folds of the container, the heavysheet being of less width than the light sheet, but of the same lengthand the sheets being positioned with their ends coinciding and withtheir medial longitudinal lines substantially coinciding, the laminatedcentral portions of the blank being relal2 tively stiff, and themarginally extending portions of the light sheet being relatively softand pliable, said bonding substance also being adapted to subsequentlyserve as a seal and toretain the laminated and pliable portions infolded condi- 11. Packaging means comprising a laminated blank formedwith at least one relatively heavy paper sheet and at least onerelatively light sheet of cellulose material, such blank being treatedwith a. moisture proof adhesive substance which secures the heavy sheetthroughout its area to the light sheet and renders the blanksubstantially impervious to air and moisture, spaced parallel fold linesextending transversely of the laminated central portion of ,the blank,the heavy sheet being of a width corresponding to one dimension of thefinished package but being of less width than the light sheet but of thesame length, the sheets being positioned with their medial longitudinallines and ends coinciding, the laminated central portion of the blanksbeing relatively stiff and having a width corresponding to one dimensionof the finished package.

12. Packaging means comprising a laminated substantially rectangularblank suitable for forming into a container having substantially planesurfaced panels, said blank formed with at least one relatively heavysheet of cellulose material and at least one relatively light sheet ofcellulose material, such blank possessing a moisture proofing andbonding substance at least on 'the surfaces thereof which secures theheavy sheet throughout its area to the light sheet and renders the blanksubstantially impervious to air and moisture, spaced parallel scoredfold lines extending transversely of the laminated central portion ofthe blank to predetermine and fix the location of the longitudinal edgefolds of the container, the heavy sheet being of less width than thelight sheet, but of the same length and the sheets being positioned withtheir ends coinciding and with the sides of the heavy sheet spacedinwardly from the sides of the light sheet, the laminated centralportion of the blank being relatively stiff, and the marginallyextending portions of the light sheet being relatively soft and pliable,

said bonding substance also being adapted to subsequently serve as aseal and to retain the laminated and pliable portions in foldedcondition.

CHARLES D. MUILINIX.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

